FLOW VARIABILITY IN NEW-ZEALAND RIVERS AND ITS RELATIONSHIP TO IN-STREAM HABITAT AND BIOTA

被引:114
作者
JOWETT, IG
DUNCAN, MJ
机构
[1] Freshwater Fisheries Centre, Ministry of Agriculture and Fisheries, Christchurch, P.O. Box 8324, Riccarton
[2] Hydrology Centre, DSIR Marine and Freshwater, Department of Scientific and Industrial Research, Christchurch
关键词
Benthic invertebrates; Classification; Community structure; Discriminant analysis; Flow variability; Hydrology; In‐stream habitat; Morphology; Periphyton; Trout;
D O I
10.1080/00288330.1990.9516427
中图分类号
S9 [水产、渔业];
学科分类号
0908 ;
摘要
Flow variability indices were determined for 130 sites on New Zealand rivers and the sites were divided into groups based on these indices. Univariate and discriminant analyses were used to identify the catchment characteristics which contributed to flow variability. Climate, as determined by topography, geographic location, and the composition of the regolith (especially water storage capacity and transmissivity characteristics), accounted for a broad regional distribution of groups. Flow variability decreased with catchment size and area of lake and, to a lesser degree, with catchment slope. Relationships were found between flow variability, and morphological and hydraulic characteristics. The longitudinal variability of water depth and velocity increased with flow variability, indicating a more pronounced pool/riffle structure in rivers with high flow variability. Mean water velocity at mean annual low, median, and mean flow was higher in rivers of low flow variability than in rivers of high flow variability. There were strong associations with periphyton communities and trout distribution and abundance and a weak association with benthic invertebrate communities. Water velocity was the most important hydraulic variable; it could be linked to changes in water temperature, benthic invertebrate and periphyton community structure, and trout distribution and abundance. © Crown copyright 1990.
引用
收藏
页码:305 / 317
页数:13
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